Math Problem Statement

3x+4y=-3 , x+2y=-1

Solution

We are given the following system of linear equations:

  1. 3x+4y=33x + 4y = -3
  2. x+2y=1x + 2y = -1

Let's solve this system using the substitution or elimination method. I'll use substitution for this problem.

Step 1: Solve the second equation for xx

From the second equation: x+2y=1x + 2y = -1 Solve for xx: x=12yx = -1 - 2y

Step 2: Substitute x=12yx = -1 - 2y into the first equation

Substitute this expression for xx into the first equation 3x+4y=33x + 4y = -3: 3(12y)+4y=33(-1 - 2y) + 4y = -3

Step 3: Simplify and solve for yy

Distribute the 33 on the left-hand side: 36y+4y=3-3 - 6y + 4y = -3 Combine like terms: 32y=3-3 - 2y = -3 Add 3 to both sides: 2y=0-2y = 0 Solve for yy: y=0y = 0

Step 4: Substitute y=0y = 0 back into the expression for xx

Now, substitute y=0y = 0 into x=12yx = -1 - 2y: x=12(0)=1x = -1 - 2(0) = -1

Final Solution:

The solution to the system is: x=1,y=0x = -1, \quad y = 0

Would you like any further details or have any questions?

Here are five related questions:

  1. What is the graphical interpretation of the solution to this system of equations?
  2. How can we use the elimination method to solve this system instead?
  3. What happens if the system of equations has no solution?
  4. How can we check if the solution we found is correct?
  5. Can we represent this system of equations in matrix form?

Tip: Always substitute the values of xx and yy back into the original equations to verify the solution!

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Algebra
Substitution Method

Formulas

Substitution formula: x = -1 - 2y

Theorems

Fundamental Theorem of Algebra (related to solving linear systems)

Suitable Grade Level

Grades 9-11